Electronic – Detect the first rising edge of 3 input signals


I have 3 input signals which are pulse waveforms The output is switch to high once once all 3 first rising edges of 3 inputs are detected.
Is there a digital circuit from logic gates, flip flop that can do that?
I am thinking about flip flop but the problem is that it detects with every rising edge not just the first rising edge.

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Best Answer

You could use the circuit below with 3 D flip-flops and one 3-input AND gate. You would also need to use the reset input of the flip-flops to bring the output back to zero (not indicated in the schematic).


simulate this circuit – Schematic created using CircuitLab